Duplicate emails are a serious problem, affecting productivity and emailing. The best way to eliminate them is to configure rules within Outlook. You can also disable your antivirus program, which can interfere with the sending and receiving process. Once you've deleted these programs, you should open Outlook and remove the duplicate email accounts. Otherwise, you can't
remove the duplicate emails from Outlook. The only solution is to reset the settings of your antivirus program and your anti-spam software.
See also -
emailspedia.com/how-to-stop-receiving-du...ate-emails-in-gmail/ 
